APPENDIX 105 



if the animals in it live naturally in quiet water. Among 

 the more available plants for use in aquaria are the follow- 

 ing (Fig. 10) : 



" Waterweed, Elodea canadensis; 



11 Bladder wort, Utricularia (several species) ; 



" Stoneworts, Chara and Nitella (several species of each) ; 



" Water starwort, Callitriche (several species) ; 



" Water cress, Nasturtium officinale; 



" Frog spittle, or water silk, Spirogyra; 



" A small quantity of duckweed, Lemna, placed on the 

 surface of the water adds to the beauty of the aquarium. " 



BIRDS AND THEIR EGGS. We do not believe in making 

 collections of the skins and eggs of birds. We believe in 

 studying birds in the green fields and wooded glens with a 

 field glass and notebook. If a collection must be made for 

 the school, consult Davie's " Methods in the Art of Taxi- 

 dermy " and Bendire's " Directions for Collecting, Prepar- 

 ing, and Preserving Birds' Eggs and Nests." 



Vertebrates and invertebrates, other than birds, mammals, 

 and insects, may be preserved in 85% alcohol or 4% 

 formalin, in glass jars, so that they may be examined with- 

 out being handled. Jars for this purpose may be obtained 

 of dealers in laboratory supplies. Fish had better be pre- 

 served in alcohol. 



BOOKS. There is no doubt that, in the study of nature, 

 books are often used too much. Yet a temperate use of 

 the right kind of books is a great inspiration. For example, 

 the author believes that the fifteen minutes spent now and 

 then in reading to a class short extracts from Kipling, 

 Bullen, Burroughs, Sharp, and others have been very 

 profitable minutes. There is no more interesting descrip- 



